Start at Z=0 in manual probing

Marlin/Marlin_main.cpp

 
     #if MANUAL_PROBE_HEIGHT > 0
       feedrate_mm_s = homing_feedrate_mm_s[Z_AXIS];
-      current_position[Z_AXIS] = LOGICAL_Z_POSITION(Z_MIN_POS) + 0.2; // just slightly over the bed
+      current_position[Z_AXIS] = LOGICAL_Z_POSITION(Z_MIN_POS); // just slightly over the bed
       line_to_current_position();
     #endif
 

Marlin/ultralcd.cpp

         current_position[Y_AXIS] = LOGICAL_Y_POSITION(y);
         planner.buffer_line_kinematic(current_position, MMM_TO_MMS(XY_PROBE_SPEED), active_extruder);
         #if MANUAL_PROBE_HEIGHT > 0
-          current_position[Z_AXIS] = LOGICAL_Z_POSITION(Z_MIN_POS) + 0.2;
+          current_position[Z_AXIS] = LOGICAL_Z_POSITION(Z_MIN_POS);
           line_to_current(Z_AXIS);
         #endif
         lcd_synchronize();